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Q.

The i gene in lac operon synthesises:

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a

Catalytic protein mainly responsible for hydrolysis of disaccharide

b

Protein constitutively

c

Enzymes that increases permeability of the cells to β-galactosidase

d

Transferase that detoxifies the products of lactose metabolism

answer is B.

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Detailed Solution

The i gene codes for the repressor of the lac operon. The repressor of the operon is synthesised (all-the-time – constitutively) from the i gene. The repressor protein binds to the operator region of the operon and prevents RNA polymerase from transcribing the operon.
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The i gene in lac operon synthesises: